Valve for internal-combustion engines



o. .1, F. FAJEN VALVE FOR INTERNAL COMBUSTION'ENGINES Filed March 31, 1924 2 Sheets-Sheet 1 X \va A TTORNE YS July 14, 1925. 1,545,822

o. J. F. FAJEN VALVE FOR INTERNAL COMBUSTION ENGINES Filed March 31, 1924 2 Shgets-Shae t z INVENTOR ATTORNEYS Patented July '14, 1925.

UNITED STATES OTTO J. F. FAJEN, OF STOVER, MISSOURI.

VALVE FOR INTERNAL-COMBUSTION ENGILIES..

Application filed March 31, 1924. Serial No. 703,208.

To all whom it may concern:

Be it known that I,-O'1'ro J; F. FAJEN, a citizen of the United States, and a resident of Stover, county of Morgan, and State of Missouri, have invented a new and useful Improvement in Valves for Internal: Combustion Engines, of which the following is a full, clear, and exact description.

My invention relates to improvements in valves for internal combustion engines, and it consists in the combinations, constructions, and arrangements herein described and claimed. i

An object of my invention is to provide a valve construction in which the intake and exhaust valves are housed in one valve casing, thereby obviating the necessity of a valve casing for each valve, and thus reducing the cos A further object of my invention is to provide a device of the type described, in which two valves may be located insubstantially the same space as one.

A further object of my invention is to provide a device in which the incoming charge is heated so as to provide a more efficient explosive mixture while the exhaust gas is cooled, through the giving up of its heat to the incoming charge.

A further object of the invention is to provide a device in which one ush rod and one cam will serve for operating (both the inlet .and the exhaust valves.

4 Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming part of this application, in which- Figure 1 is a vertical sectional view through the valve casing and the cam shaft, showing the valves in a position for admitting the mixture into the cylinder.

Figure 2 is a' similar sectional view through the valve casing, showing the position of the valves during the working and compression strokes, and

Figure 3 is a similar view showing the position of the valves during the exhaust stroke.

My .invention is primarilydesignedfor a four cycle engine. 'It may be applied to cylinders of any suitable size. In the drawings, I have shown a portion 'of a cylinder 1,

having a water jacket 2 of the usual type.

At 3 I have shown the exhaust passages which may lead to an exhaust manifold (not shown). Mounted integrally withthe ex- Ilgauslt pipes 3 is a cylindrical guide mem- At 5 I have shown an intake manifold which is stationary, being preferably bolted to the cylinder head. Integral with this intake pipe is an outer cylinder 6, having a closed end 7, the endsbeing integral with an inner fixed cylinder 8, which is braced at the bottom by a spider 9. An upper valve casing portion 18'is provided, having a central opening through which the valve stem 19 extends.

The valve stem-19 has secured at its lower end a valve 10 which is arranged to engage a valve seat 11 formed on the head of the.

valve stem. The lower end of the sleeve.14

is connected with a cup-shaped valve member 20, having a central opening, the edge of which constitutes a valve seat 21 for the upper edge of the valve 10. The outer lower edge 22 of the valve member 20 constitutes a valve which is arranged to engage against a valve seat 23 formed in the cylinder head.

In Figure 1, Ihave shown the crank shaft A lighter 24 and the driving gears 25 and 26 diagrammatically. The cam shaft 27 has provided thereon a cam having araised portion 28 and a lower portion 29. These are adapted to engage the roller 30 on the push rod 31', which, through the medium of the usual tap et 32, operates the valve stem 19.

F i'om the foregoing description of the various parts of the device, the operation thereof may be readily understood. Figure 1 shows the valves in the intake position. The mixture is coming through the pipe 5 and passing downwar ly into the cylinder, as indicated by the arrows. I wheel 30 leaves the portion 28, andengages the cylindrical surface 29 of'the cam, the valvewill close, owing to the action of the When the v 110 shown in Figure 3. The spring 13,406? a ily springs 13 and 16. Figure 2 shows the valves in their closed position. The charge is compressed and ignited in the usual manner, and during the compression and working strokes the valves remain closed. The cam shaft is revolved in the direction shown by the arrow in Figure 1, so that when'the lower portion 29 enga es the roller, it will push the valve stem ownwardly. As the pins or collars 12 and 17 move downwardly with the valve stem, the valves 10 and 20 will move downwardly to the position stronger spring and not having a ho movement, will hold the valve 10 against the valve 20. The exhaust gases will pass out, as indicated b the arrows: in Figure 3, into the exhaust pipe 3, and thence into the exhaust manifold (not shown). When the portion 28 of the cam is reached, it will tend to force the valve stem 19 down still farther. The valve member 20 will move downwardly until it engages the valve seat 23 (see Figure 1), while the valve 10 will continue'to move downwardly and will leave its seat at 21, thus permitting the admission of the charge in the manner already described. This cycle of operation is repeated as long as the engine is working.

It will be observed that the inrush of ga is over the hot valve 10. This tends to impart heat to the mixture and thus to increase its efliciency. .On the other hand, the exhaust passes by the cooler valve 20, and the exhaust gases are thereby cooled. The heating of the valve 20, of course, contributes to the heating of the incoming mixture, so that the device has a double purpose of heating the incoming gases and cooling the exhaust gases.

The provision of the valve casing having the two valves renders the construction compact, besides obviating the necessity of an extra cam, push rod and tappet.

I claim:

1. A valve construction for internal combustion engines comprising a valve stem, 9.

LBQELSQQ valve secured to said stem, an auxiliary valve movable relativeto said first named valve individual sprin for controlling said valve, the longitu inal movement of the valve stem in one direction serving to move both valves against thev tension of their respective springs to a position to permit exhaust of gases within the cylinder, and a further movement of the valve stem bringing the auxiliary valve in aposition to close the exhaust and to open the intake valve.

2. The combination with an internal combustion engine, of a valve construction comprising a valve stem, a valve secured to said stem, an auxiliary valve movable relative to said first named valve, spring means for holding said valves normally in engagement, whereby the intake is closed, and means for moving both valves simultaneously to bring the auxiliary valve in position to close the exhaust, the further movement of the first named valve causing the separation of the two valves and the opening of the intake.

3. The combination with the cylinder of an internal combustion engine having upper and lower valve seats in the head thereof, of a valve arranged to engage said lower seat, an auxiliary valve arran ed to en ge said upper seat, each of 'sai valves aving a face arranged to engage the face of the other valve for controlling the passage of gases.

4. The combination with the cylinder of an internal combustion engine having upper and lower valve seats inthe head thereof, of a valve arranged to engage said lower seat, an auxiliary valve arranged to engage said upper seat, each of said valves having a face arran d to engage the face of the other valve or controlling the passage of gases, and means for causing the separation of the engaged valves at predetermined times topermit the passage of gases therebetween.

OTTQ J. F. FAJEN. 

